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Catz began acting in the early 1990s, initially playing minor roles. On registering with Equity, she discovered that an actress with the name Caroline Caplan was already registered, so she had to choose a different professional name.

Since 2004, Catz has starred in ITV's Doc Martin, where she plays primary school headmistress Louisa Glasson.

Catz has continued to appear in one-off roles, including In Denial of Murder, in which she played real-life murder victim Wendy Sewell, and in an episode of Hotel Babylon. She also appeared in a two-part episode of Single Handed entitled The Stolen Child as Dr Maggie Hunter. Originally shown in Ireland in January 2008, it was broadcast by ITV on 9 August 2009.

From 2012 until 2016, she played Detective Inspector Helen Morton in DCI Banks. In November 2016, ITV cancelled the show.[2][3]

In 2014, Catz directed the documentary titled A Message to the World...Whatever Happened to Jesse Hector? Also in 2014, she narrated the BBC's television documentary Ebola – The Search for a Cure.